Washing machine



FIG. 1 is a front and right side perspective view of a washing machine showing my new design;

FIG. 2 is a front and left side perspective view thereof;

FIG. 3 is a top and front perspective view thereof;

FIG. 4 is a rear and left side perspective view thereof, and

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a washing machine, as shown and described. 